Method and apparatus for forming container closures



Nov. 24, 1936- I s. MEYER-JAGENBERG 2,061,957

METHOD AND APPARATUS FOR FORMING CONTAINER CLOSURES Filed Jan. '7', 1956 3 Sheets-Sheet 1 Fig.1

19360 G. MEYER-JAGENBERG METHOD AND APPARATUS FOR FORMING comnman' CLOSURES Filed Jan. 7, 1936 5 Sheets-Sheet 2 v s i .2 .Ziulvzir F g Nbv. 24, 1936; G. MEYER JAGENBERG 2,051,967

Patented Nova 24, 1936 METHOD PVA'TEN'T OFFICE AND APPARATUS Fon FORMING CONTAINER cnosmms 'Giinther Meyer-Jagenberg, Dusseldorf, Germany Application January 7, 1936, Serial No. 58,011- In Germany January 8, 1935 8 Claims. (01. gas-36.8)

This invention is directed to a process and apparatus for forming the open. end of an otherwise closed paper container to provide for con-- venient and ready folding of such upper end to 5 insure the conventional closure wherein the sides are infolded over the inwardly angled ends.

I The type of fold employed is more or less conventional in the angular adjustment and sequence of movement ofthe various parts, and provision 10 has heretofore been made to more or less predetermine the line of fold by weakening or scoring the respective parts to direct the fold. However, whereas is the generally accepted procedure, the walls bf the, container have been impregnated 15 with wax or other waterproofing material, such walls have asa result been so appreciably stiffened that folding, even along the predetermined lines, has become a; matter of dimculty.

I The primary object of the present invention is no to. form the respective opposed ends of the respective folds of the container on planesinwardly offset from the normal plane, and further forming I such ends with inverted'Y-shaped .grooves de presed' into the surfaces of the ends relative to the outer surface thereof; the sides of the .folded portion having similar grooves or depressions.

on lines transverse the container and indefinite relation to the end grooves to facilitate the foldingoperatiom' f r A further object of the invention is the provision of an apparatus whereby the inward oifsetting of the ends of the area to be folded and of the formation of the sides and ends with the defined ooving may be effected in a single operation;

5 W1 such apparatus involving a central app'ropriat'ely formed die over which the folding area of the mouth ofthe container is placed, together with pressing blocks appropriately cooperating with the ends i2nd sides of the die through the interposed ma rial to simultaneously complete the formation, the pressing-blocks being simultaneously removable into .and out of operation. I

The invention is illustrated in the accom Jpanying drawings, in which: 45 Figure lis a perspective view of a conventional form of container, with the end'to be. folded to form the. closure made up according; to th P esent invention. v

Figure 2.. is a plan of the-apparatus for forming? the-folding sections of the present invention.

Figure 3 is ,a section of the line -1II- -III of' Figure 2.

Figure 4 is a plan of the die and cooperating pressing blocks,- the parts being shown separated and the die being in horizonta seems.

forming the creasing lines along th in folding the closure.

Figure 5 is a vertical section on the line- V-V of Figure 4. v Figure 6 is a perspective view of the die. Figures 7 and 8 are perspective views respectively of the end and side pressing blocks, the views being taken to show their operative faces.

The invention is here illustrated "as applied to a. more or less conventional type of paper or like container in which the lower end is circular or oval, the main length of body wall rounded, and

the upper end substantially rectangular, which upper open end is designed to-have its end portions infolded on reentrant angles to bring the side portions into substantial contact, the side portionsfolded down upon themselves to complete a. conventional closure. Ordinarily the ends and sides are scored or marked to guide the line of fold, but where the container asa whole is impregnated with wax of other water-proofing materlal, as is usually the case, the indicated lines of fold are so stiffened bythe water-proofing material as to be of little value in indicating a folding operation or in facilitating such operation, and thus folding becomes more or less difflcult. 5

' In carrying out the method, the sections a, b, 2

c, hereinafter termed theendsections of the closure, are bodily pressed inwardly to normally rest as an entirety in a plane inwardly of .the

normal plane of these. portions of the closureua These inwardly oil'set end portions are embossed to form channels it which ar -of inverted Y- form and depressed relative to the outer face of the end. The leg of the Y-formdepression extends from the upper edge of the end vertically and centrally thereof-to a point approximating, the center, of' such end, the branches of the Y extending from the lower end of the leg to -the-opposite lower edges of the end but terzmina'ting short of theamargins of the depressed 4 portion. I K I Thus, the inwardly offsetends of the fold,

outlined by the lines WgX, KAY, Y--Z, and Z- W, have an inverted Y-shaped channel,- the meeting lines of which join at the point U. The

side walls of the closure are alsorformed at an .appropriate point with a groove in channel e,

depress d with respect to the outer face of the side, nd' extending transverse the container from the point .8 to the point T. The-line of the depression e is approximately on the same horiz'ontalplane. as the point U, :tofacilitate elengthfi-T Theapparatus provided for carrying out the 5 5 50 a container.

offset face is formed with a recess or channel d corresponding to the channel it to be formed in the ends of the closure. The side walls of the die have a depressed groove or channel e to form the groove e in the closure.

The pressing blocks 2 for cooperating with the ends of the die to form the ends of the 15 closure have a pressure face sized to cooperate with the inwardly offset face of the ends of the die and a rib d" to accurately cooperate with the groove or channel d in the ends of the die. The pressing blocks 3 are plain except for a 20 transverse rib s" positioned to cooperate with the groove or channel e in the side faces of. the die.

The dies and pressing blocks are supported upon ,a base or ta ie, the die being centrally 5 arranged thereon; the end pressing blocks 2,po-

sitioned to cooperate with the ends of the dies, are connected to slides 4 movable between guides 6; and the side pressing blocks 3, positioned to cooperate with the sides of the die, are con- 30 nected to slides 8 movable between guides I.

Rotatable beneath the base or table is a cam plate Ill having cam grooves I cooperating with roller pins depending from the end pressing blocks 2, with the cam plate having an addi- .35 tional cam l to cooperate with roller pins depending rom the presser blocks 3 or th slides 5 carrying such blocks. A power shaift acting through appropriate gearing drivesthe cam plate II and the respective cam grooves 8 and 40 9 are so formed that the pressing blocks 2 are first moved toward the die and when the move-- ment of the blocks 2 is nearly complete, the movement of the bloc 3 is inaugurated.

The open upper en of the otherwise com-' 45 pleted container is positioned'over the die, in

proper relation thereto, and the cam disk operated ,to insure the appropriate described operation to complete the described formation of the respective ends and sides of a closure part of If desired and to facilitate the folding operat the parts may be heated through any at) ropriate electrical or other heating means, which is entirely conventional and not necessary toillustrate. of con the form 55 of the container, otherwise than with respect to that portion thereof forming the. closure, is

wholly' immaterial, and all possible and. permis- 1 sible forms of container are to be considered within the scope of this invention.

The invention is to be distinguished from heretofore proposed constructions wherein, for example, a forming block is placed within and designed to till the container and to have-the closure ends initiallyfolded over this block to I 5 provide a folding guide for later use. This construction is objectionable as it requires the opening of the container after initial folding and the removal of the forming block, necessitating a troublesome and extended operation. Another 70 known method involves the use of a forming block inserted into the container against which the walls of the closure are pressed, with the forming block providing-folding lines of weakness. In this method, there is initial folding of 75 the closure, and after the forming p rts are 8. An apparatus for removed, there is a tendency in the closure to assume at least a partially folded position. This is highly objectionable, particularly where the containers are to be used in an automatic filling machine or are to be disposed in nested relation for single withdrawal in use.

What is claimed to be new is:

l. A step in the method of forming the walls of an infolding closure of containers, consisting in offsetting the ends of the closure section bodily inwardly in flat relation.

2. A step in the method 01' forming the walls of an ini'olding closure for paper containers, consisting in arranging the ends of the closure on planes inwardly of and substantially parallel with the nonnal plane of the container.

3. A method of forming the walls of an. infolding closure for containers, consisting in 0dsetting'the end portions of such closure bodily inwardly in flat relation and forming in the inwardly offset ends an inverted Y-shaped channel.

4. A method of forming the walls of an infolding closure for containers, consisting in onsetting the end portions of such closure bodily inwardly in flat relation and forming in the inwardly offset ends an inverted Y-shaped channel, with the ends of the branches of the channel terminating short of the offset end portions.

5. An apparatus for forming an infolding end closure for containers, including a die over which the closure end is to be placed, and pressure blocks cooperating with the ends and sides or the die through the interposed container, the ends 0! the die being recessed to a substantially uniform depth to present a flat bottom and the pressure blocks cooperating therewith fitting -within the recess to bodily oifset the ends of the closure against 'the flat bottom "to an extent permitted by the depth of the recess with respect to the normal plane of the container. 1

6. An apparatus for forming an infolding en closurefor containers, including adie over which the closure end is to be placed, pressure blocks cooperating with the ends and sides or the die through the interposed container, the ends of the die being recessed for asubstantially uniform depth to present a flat bottom aaggthei pressure blocks cooperating therewith fit within the recess to bodily offset the ends of the closure to an extent permitted by the depth of the recess, the onset portionsbeing flat and in planes substantially parallel to the normal plane of the container, and cams for moving the pressure blocks into cooperation withthe container walls overlying the die. v,

'I. an apparatus for forming an infolding end closurefor containers, including a die over which the closure end is to be placed, pressure blocks cooperating with the .ends and sides of the die through the interposed container, the ends of the die being recessed for a. substantially uniform depth to present a flat bottom and the pres-. sure blocks cooperating therewith fitting within the'recessto bodily offset the ends of the closure to an extent permitted by the depth of the recess, the ofiset portions being flat and inplanes container, and cams for moving thepressur'e blocks into cooperation with the container walls overlying'the die, said cams operating to move the pressure blocks forming the ends or the closure in advance of the pressure blocks forming the sides of the closure. P

substantially-parallel to the normal plane of the forming infolding end 7 closure for containers, including a die over which the closure end is to be placed, and pressure blocks cooperating with the ends and sides of the die through the interposed container, the ends of the die being recessed for a. substantially uniform depth to present a flat bottom and the pressure blocks cooperating therewith fitting within the recess to bodily offset the ends of the closure to an extent permitted by the depth of the recess; the offset portions being flat and in planes substantially parallel to the normal plane '0! the container, the walls of the die and the faces of the pressure blocks being formed 5 to depress channels in the ends-and side walls of the closure portion 0! the container.

GUNTHER lmYER-JAGENBEBG. 

